OS 10.4 - Start up problems

My ibook slowed down significantly over the last few days and now simply refuses to start at all.. i've tried the single user terminal disk check but it doesn't either find a problem nor tell me the disk is intact.. something about a BUS error.. i can't start in safe mode and now all i get after the tone is a grey screen.. not even the macintosh logo and loading gear start.. seems farily terminal/expensive to me but any advice for someone more in the know would be much appreciated.. james

mac: a waterproof raincoat made of rubberized fabric
MAC: a data communication protocol sub-layer, also known as the Media Access Control
Mac: a brand name which covers several lines of personal computers designed, developed, and marketed by Apple Inc.

mac: a waterproof raincoat made of rubberized fabric
MAC: a data communication protocol sub-layer, also known as the Media Access Control
Mac: a brand name which covers several lines of personal computers designed, developed, and marketed by Apple Inc.

mac: a waterproof raincoat made of rubberized fabric
MAC: a data communication protocol sub-layer, also known as the Media Access Control
Mac: a brand name which covers several lines of personal computers designed, developed, and marketed by Apple Inc.